Articles | Volume 17, issue 22
https://doi.org/10.5194/acp-17-13819-2017
https://doi.org/10.5194/acp-17-13819-2017
Research article
 | 
20 Nov 2017
Research article |  | 20 Nov 2017

The role of highly oxygenated molecules (HOMs) in determining the composition of ambient ions in the boreal forest

Federico Bianchi, Olga Garmash, Xucheng He, Chao Yan, Siddharth Iyer, Ida Rosendahl, Zhengning Xu, Matti P. Rissanen, Matthieu Riva, Risto Taipale, Nina Sarnela, Tuukka Petäjä, Douglas R. Worsnop, Markku Kulmala, Mikael Ehn, and Heikki Junninen

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Cited articles

Arnold, F.: Atmospheric ions and aerosol formation, Space Sci. Rev., 137, 225–239, 2008.
Berndt, T., Richters, S., Jokinen, T., Hyttinen, N., Kurten, T., Otkjaer, R. V., Kjaergaard, H. G., Stratmann, F., Herrmann, H., Sipila, M., Kulmala, M., and Ehn, M.: Hydroxyl radical-induced formation of highly oxidized organic compounds, Nat. Commun., 7, 8, https://doi.org/10.1038/ncomms13677, 2016.
Bianchi, F., Dommen, J., Mathot, S., and Baltensperger, U.: On-line determination of ammonia at low pptv mixing ratios in the CLOUD chamber, Atmos. Meas. Tech., 5, 1719–1725, https://doi.org/10.5194/amt-5-1719-2012, 2012.
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Naturally charged highly oxidised molecules (HOMs) were characterized using advanced mass spectrometers. Two different classes of compounds, clustered with the nitrate and bisulfate ions, were identified: HOMs containing only carbon, hydrogen and oxygen and nitrogen-containing HOMs or organonitrates (ONs). They exhibit strong diurnal variations where HOMs peak during night and ONs during day. Finally, large clusters containing up to 40 carbon atoms (four oxidized α-pinene units) were observed.
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